Distribution of seismic wave speed changes associated with the 12 May 2008 Mw 7.9 Wenchuan earthquake. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2010

Distribution of seismic wave speed changes associated with the 12 May 2008 Mw 7.9 Wenchuan earthquake.

Résumé

We used continuous recordings in Sichuan, China to track the temporal change of the seismic wave speed at a regional scale, for 2 years including the Wenchuan Mw 7.9 earthquake. The data are recorded by a temporary network of 156 broad-band seismographs in a region that covers the southern 2/3 of the fault activated during the earthquake. A doublet analysis applied on the codas of seismic noise cross correlation functions is used to detect temporal velocity changes. We found clear evidence that the seismic velocity drops by up to 0.08% in the fault region just after the earthquake with fluctuations within 0.02% before the earthquake. We compared the measurements in different sub-arrays to get a spatial distribution of the velocity changes. This distribution is consistent with the volumetric strain change during the Wenchuan earthquake and shows that the co-seismic velocity change is not controlled by the response of sediments.
Fichier principal
Vignette du fichier
CJ_GRL_2010.pdf (823.52 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00704479 , version 1 (05-06-2012)

Identifiants

Citer

Jiu Hui Chen, Berenice Froment, Liu Qi Yuan, Michel Campillo. Distribution of seismic wave speed changes associated with the 12 May 2008 Mw 7.9 Wenchuan earthquake.. Geophysical Research Letters, 2010, VOL. 37, pp.4 PP. ⟨10.1029/2010GL044582⟩. ⟨hal-00704479⟩
170 Consultations
328 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More